Protic ionic liquid assisted solution processing of lead halide perovskites with water, alcohols and acetonitrile

Öz, Senol; Burschka, Julian; Jung, Eunhwan; Bhattacharjee, Ripon; Fischer, Thomas; Mettenbörger, Andreas; Wang, Hongxia; Mathur, Sanjay

doi:10.1016/j.nanoen.2018.07.005

Cited by 55 publications

(46 citation statements)

References 42 publications

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“…The amine carboxylic acid IL methylammonium formate (MAFa) was first employed as a perovskite precursor solvent, and a large-area, orientationally pure crystalline MAPbI 3 film with periodic microarrays and very low trap state density can be fabricated by a sharp liquid-to-solid transition [ 20 ]. At the same time, a new IL, methylammonium propionate (MAPa), was also demonstrated to be a novel solvent system for PSCs [ 22 ]. Recently, we successfully reported an IL solvent, methylammonium acetate (MAAc), which leads to power conversion efficiency (PCE) over 20% by a simple one-step method in humidity air without any additive [ 23 ].…”

Section: Introductionmentioning

confidence: 99%

Origin of High Efficiency and Long-Term Stability in Ionic Liquid Perovskite Photovoltaic

Chao

Niu

et al. 2020

Research

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Environment-friendly protic amine carboxylic acid ionic liquids (ILs) as solvents is a significant breakthrough with respect to traditional highly coordinating and toxic solvents in achieving efficient and stable perovskite solar cells (PSCs) with a simple one-step air processing and without an antisolvent treatment approach. However, it remains mysterious for the improved efficiency and stability of PSCs without any passivation strategy. Here, we unambiguously demonstrate that the three functions of solvents, additive, and passivation are present for protic amine carboxylic acid ILs. We found that the ILs have the capability to dissolve a series of perovskite precursors, induce oriented crystallization, and chemically passivate the grain boundaries. This is attributed to the unique molecular structure of ILs with carbonyl and amine groups, allowing for strong interaction with perovskite precursors by forming C=O…Pb chelate bonds and N-H…I hydrogen bonds in both solution and film. This finding is generic in nature with extension to a wide range of IL-based perovskite optoelectronics.

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Section: Introductionmentioning

confidence: 99%

Origin of High Efficiency and Long-Term Stability in Ionic Liquid Perovskite Photovoltaic

Chao

Niu

et al. 2020

Research

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“…With the development of ILs in the field, a new IL methylammonium propionate (MAP) as a solvent to prepare perovskite film was identified as the most promising candidate because of its chemical stability and compatibility for both single‐ and two‐step solution film‐forming methods (Figure 9e). [ 90 ] Using MAP as a solvent, the prepared CH 3 NH 3 PbBr 3− x film showed a morphology of uniformly distributed large cubic crystals (Figure 9f), and this morphology was proposed to be beneficial for perovskite light‐emitting diodes. [ 163 ] However, perovskite precursor prepared by pure MAP exhibited a high viscosity, which was challenging to process a uniform thin film by a spin‐coating process at room temperature.…”

Section: Toxicity Reduction Of Solventmentioning

confidence: 99%

“…Most importantly, perovskite precursor solution using MAP/H 2 O as solvent was shown to be able to print a graphical perovskite film on regular office paper sheets using a commercial inkjet printer, which is exciting for the fabrication of flexible devices (Figure 9g). [ 90 ] Although this work only introduced a small amount of MAP into the perovskite precursor solution for PSCs application, it opened up the way for the further development and optimization of PSCs based on “green” ILs.…”

Section: Toxicity Reduction Of Solventmentioning

confidence: 99%

Solvent Engineering of the Precursor Solution toward Large‐Area Production of Perovskite Solar Cells

et al. 2021

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Solar cells based on emerging organic–inorganic hybrid perovskite materials have reached certified power conversion efficiency as high as 25.5%, showing great potential in the next generation of photovoltaics toward large‐scale industrialization. The most competitive feature of perovskite solar cells (PSCs) is that the perovskite light absorber can be fabricated by a low‐cost solution method. For the solution method, the characteristics of the solvent play a key role in determining the crystallization kinetics, growth orientation, and optoelectronic properties of the perovskite film. Although significant progress has been made in the field of solvent engineering in PSCs, it is still challenging for the solution method to sustainably produce industrial‐scale PSCs for future commercialization applications. Herein, the advanced progress of solvent engineering of precursor solution in terms of coordination regulation and toxicity reduction is highlighted. The physical and chemical characteristics of different solvents in reducing the toxicity of the solvent system, regulating the coordination property of the precursor solution, controlling the film‐forming process of the perovskite film, and adjusting the photovoltaic performance of the PSC are systematically discussed. Lastly, important perspectives on solvent engineering of the perovskite precursor solution toward future industrial production of high‐performance PSCs are provided.

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“…Therefore, it is urgent to develop green solvent system with less toxicity or ideal nontoxic. [ 17 ] Cao et al reported a two‐step spin‐coating procedure to prepare high‐quality perovskite films with all green solvents using the Hansen solubility parameters theory. [ 18,19 ] The charateristic peak of CsPbBr 3 (15.3°, 21.7°, and 30.8°) were clearly observed with a proper CsBr/H 2 O concentration of 250 mg mL − [ 1 ] ( Figure a).…”

Section: Precursor Solventsmentioning

confidence: 99%

“…CsPbBr 3 film with full coverage and high quality was obtained. In addition, a new green perovskite precursor ink system comprised of protic ionic liquids (PILs) and acetonitrile was reported by Öz et al [ 17 ] The appropriate chemical stability and vapor pressure of PILs could replace high‐boiling aprotic polar solvents in the deposition of hybrid perovskite films.…”

Section: Precursor Solventsmentioning

confidence: 99%

Green–Solvent–Processable Perovskite Solar Cells

Cui

Wang

Ding

et al. 2020

Adv Energy and Sustain Res

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Organ–inorganic hybrid perovskite solar cells (PSCs) have attracted extensive attention with a certified power conversion efficiency (PCE) beyond 25% due to their superior photoelectric properties. However, most reported high‐efficiency PSCs are fabricated with toxic solvents, which raises a major obstacle for potential commercialization. Herein, the recent research progress of green solvents for high‐efficiency PSCs is summarized from antisolvents, precursor solvents, and solvents for electron/hole transport materials, aiming to promote the development of green solvents for PSCs and meet the requirement of sustainable development of the PSCs field. Future challenges and prospects are also discussed to expedite the rational design of green‐solvent‐processed PSCs.

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Protic ionic liquid assisted solution processing of lead halide perovskites with water, alcohols and acetonitrile

Cited by 55 publications

References 42 publications

Origin of High Efficiency and Long-Term Stability in Ionic Liquid Perovskite Photovoltaic

Origin of High Efficiency and Long-Term Stability in Ionic Liquid Perovskite Photovoltaic

Solvent Engineering of the Precursor Solution toward Large‐Area Production of Perovskite Solar Cells

Green–Solvent–Processable Perovskite Solar Cells

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